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Information by Business Segment (Details 4) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Reconciliation of segment assets to total assets
Total COPT consolidated assets	$ 3,855,369	$ 3,656,005	$ 3,650,366
Operating properties lease liabilities included in segment assets	16,686
Segment assets
Reconciliation of segment assets to total assets
Total COPT consolidated assets	3,024,072		3,074,986
Operating properties lease liabilities included in segment assets	16,645		0
Non-operating property assets
Reconciliation of segment assets to total assets
Total COPT consolidated assets	597,301		420,109
Other assets
Reconciliation of segment assets to total assets
Total COPT consolidated assets	$ 217,351		$ 155,271

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

No definition available.

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